Igniter trip mechanism



. A. R. BAKER. ,IGNITER TRIP MECHANlSM.

I APPLICATION HLED JULY 20, 191B.

Patented June 13, 1922.

2 SHEETS-SHEET I.

A. R. BAKER.

IGNITER TRIP MECHANISM.

. 1 APPLICATION FILED JULY 20. 1918. Patel-itedlune 13, 1922.

2 SHEETS-SHEET 2.

gun

ami Wm UNITED S A ES ARTHUR R. BAKER, or INDIANAPOLIS, INDIANA,AssIeNoR, BY

PATENT OFFICE.

MESNE ASSIGN- MENTS, TO CHARLES Gr. MCCUTCHEN, OIEEINDIANAPOLIS,INDIANA,

IGNITER TRIP MECHANISM.

Application filed July 20, 1918. Serial No. 245,849.

To all whom it may concern: 1

Be it known that I, ARTHUR R. BAKER, a citizen of the United States,residing at Indianapolis, in the county of lVlarion and State ofIndiana, haveinvented new and useful Igniter Trip Mechanisms, of whichthe following is a specification.-

, It is the object of my invention to im prove and simplify theoperatingmechanism for oscillating ignition magnetoes for internal combustionengines: to make such operating mechanism accurate in its action, sothat it trips at a predetermined point with substantially novariation;-to eliminate all extraneous tripping devices for producingthe tripping action; to minimize the tendency to flex the operating rod,and in consequence the vibrations which destroy accuracy; to produce anaccurate change in this predetermined point for running and startingconditions; to produce a tripping action which does not interfere withthe quick snapping of the oscillating member of the magneto, and whichin consequence does not lessen the ignition spark; to minimize wear; andto provide a device which may be used interchangeably witheither sideuppermost withoutany change, and may be usedfor either right or lefthand mounting by the mere selection between right and left hand carryingeccentrics, as conditions require.

The accompanying drawings illustrate my invention. Fig. l is anelevation of an oscillating magneto and part of the associated engine,with my improved operating mechanism, showing the eccentric in startingposition; Fig. 2 is a plan of the trip lever and eccentric, with someparts broken away, as arranged for left hand mounting, with. theeccentric in running position; Fig. 3 is a view similar to Fig. 2, asarranged for right hand mounting, which right hand mounting is alsoshown in all the other figures of the drawing except Fig. 2; Fig. 4 isan elevation, in partial section, of the trip lever and its mounting,showing its relation to the trip finger of the oscillating member of theassociated magneto and to the electrodes when the parts are at rest, andshowing the eccentric in running position; and Fig. 5 is a view similarto Fig. 4:, though wholly in elevation, showing in full lines therelation of the parts just at the moment of tripping and in dotted linesthe parts after tripping.

The internal combustion engine 10, of which only a fragment is shown,has its ignition spark supplied by a magneto 11, whlchis of theoscillating type having a movable member mounted on a shaft 12'andbiased to a normal position by a pair of returning springs 13 actingbetween two fixed posts 14 and two pins 15 on a cross head 16 fixed onsaid shaft 12. The'cross head 16 has a finger 17 which engages a finger18 connected with the movable electrode 19 (Fig. 4:) and moves suchmovable electrode away from the fixed electrode 2-0 when the cross head16 and the movable" member of the magneto are moved in acounterclockwise direction (Figs. 1 and 1) from their normal position,or to the dotted line position shown in Fig. 5. The finger 18 is biasedtoward the finger 17, and the movable electrode 19 toward the fixedelectrode 20, by a suitable spring 21. The magnetp and the electrodesareboth conveniently mounted on a bracket 22, which is suitably fastenedto the engine 10. So far this isa standard construction. 1

The engine 10 has the usual rotating cam 25, which co-operates with aroller :26 on the end'of afreciprocable rod 27 to produce the desiredmovement of such rod. The rod 27 operates the magneto; and may alsooperate the exhaust valve mechanism, if desired, as indicated by theextension of said rod'to the left in Fig. 1 past the magneto, thoughthis forms no part of the present invention; A clamp 28 is mounted onthe'rodq27 in any desired. positiontherealong, and is held in suchdesired position by clamping screws 29. The clamp 28 is provided withalaterally projecting pin 30; on which is an eccentric bushing 31provided at the outer end of the pin 30 with a flange 82, a pair ofoperating wings 33, and two movement-limiting fingers 3 1- projectingfrom the flange 32 infthe plane thereof. The bushing 81 is held'on thepin 30 in any suitable manner, as by a spring 100 ring 35. A trip leveror pusher is pivoted at one end on the eccentric bushing 81,"between thebody'of the clamp 28 and the flange 82. This trip lever comprises asleeve 36 and a bolt 37, the latter being screwed 105 into the open endof such sleeve 36 and held in proper position therein by a locknut 38. Afinger 39 pnojects from the pivot hub of the sleeve 36 either downward(Figs. 1 and 4 or upward (Fig. 5), and a tension spring 110 40 connectsthis finger 39 to a lug 41 on the clamp 28. The trip lever is placed onthe bushing 31 with the finger 3S) upward or downward, according as thelug ell and spring 4-0 are above or below the trip lever; for this willvary with diiferent engines. The trip lever may thus be reversed inposition, as required by the character of the bracket 28 and the engineconditions, with out necessitating any change in the trip lever itself.In either case the spring 40 tends to move the trip lever in a clockwisedirection (Figs. 1, at, and to produce engagement of the sleeve 36 withan adjustable stop screw 12 mounted in a lug 43 on the clamp 28. Thefree end of the bolt of the trip lever has an operating head lat, whichcooperates with a trip finger 45 on the cross head 16. That edge of thetrip finger which engages the head 41 i is rounded; and the edges of thebolt head l4: are correspondingly rounded, for though only the upperedge of the bolt head operates for a given position the rounding of allfour edges is provided to allow for wear and to permit the aforesaidreversal of the trip lever to bring the finger 39 either upward ordownward. The adjustment of the screw 42 controls the height of theupper rounded edge oi the bolt head H with relation to the rounded edgeof the trip finger 515, and in conjunction with the adjustment oil? theclamp 28 on the rod 27 determines the tripping point. By turning theeccentric 31 through half a revolution, the trip lever is shifted as awhole to the left (for running) and to the right (for starting), withoutvarying the vertical position of the head 44-. In order to ensure this,the surface of the eccentric 31 is provid d with two retaining notchesat its thickest and thinnest points respectively, and a springpressedstop button 4-7 is mounted within the sleeve 36 in position to engageone or the other of these notches 4:6 according as the eccentric is inrunning or starting position; the stop button 17 is fastened to one endof a compression spring 1-8, the other end of which is fastened to theinner end oil? the bolt 37, for the threads of the bolt 87 are not foradjustment purposes. In addition to the positioning stop button 457, themovement of the eccentric 31 past the starting or the running positionis prevented by the engagement of the movement-limiting fingers 341 withone or the other of two lateral bosses 49 projecting from the two sidefaces of the sleeve 36. The fingers 34 are arranged so as to require themovement of the thickest part of the eccentric over the pivot pin 30 andto prevent such thickest part from moving under the pin 30 when theeccentric is turned from starting to running position; so that duringthe intermediate parts of such movement the pivotal end of the triplever is raised and the operating head Shl is lowered with relation tothe positions they occupy when the eccentric is in either starting orrunning positions. This prevents delay of the tripping beyond the properpoint, and avoids any possible breakage of the machine by jamming, incase a tripping action occurs as the eccentric is being moved fromstarting to running position. This protective action is augmented byreason of the fact that the turning of the eccentric bushing fromstarting to running position, which turning occurs while the engine isin operation,is in a conntcrclockwise direction from the position shownin l? 1 to the position shown in Figs. 1- and 5, so that the dra of thestop button L7 in the starting notch ell ol the eccentric 551 may carrythe trip lever in a coiintercloclcwise direction around its pivotal axisit it produces any movement at all of such trip lever. thus lowering theoperating head l-l so that though a complete missing oi? a tiringoperation may occur jan'nning ol? the parts is el'icctually prevented.

In di'll'erent engines, the operating rod 27 and the magneto and its aiociated parts may be located on di'll'crent sides of the engine. ll iththe right hand nn'iunting, shown in lligs. 1, 41 and 5, with the rod 2iand the magneto on the right hand side of the engine as viewed from thecylinder head end, the pin 30 projects through the pivot hole in thetrip lever in the opposite direction from what it does with the lefthand mounting, which is indicated in i ig. and in which the rod 537 andthe magneto are on the left hand side oi? the engine as viewed from thesame end. ln both cases the eccentric bushing projects through the pivothole in the opposite direction from the pivot pin 30, so that the flange32 will be at the outer end oi said pin. The trip lever may have eitherthe right or the left hand mounting without any change; but in order toprovide for the desired .n'io'venient oi the e centric bushing so thatits thickest portion will always pass over and not under the pivot pinIll) it necessary to provide such bushings in rights and le'l'l's. shownin Figs. 3 and 2 respectively. The only dilierence hetwoen the right andleft hand bushings is that the flange -32 with the wings 32. andmotion-limiting fingers Sl; are shifted iso axially, with respect to thebody of the occentric bushings. Thus, as is clear from Figs 2, 3, 4, and5, the same trip lever may be used :t'or both right and left hand1no1n1tings and in either mounting with the finger 39 either upward ordownward; and either eccentric bushing may be used with the finger 39either in vard or downward tor the right hand or the left hand mountingrespectively.

In operation, the reciprocable rod 27 is reciprocated by the cam 25 inthe usual manner, and carries the clamp 28 and trip lever 36-37 with it.As these move to the left, the operating head a l engages the roundededge of the trip finger 4-5, and produces a clockwise movement of themovable member of the magneto and the cross head 16 against the actionof: the springs 13 from the position shown in Fig. 1 to the positionshown in full lines in Fig. 5. During this movement, the rounded edge ofthe trip finger 45 has a combined sliding and rolling movement on theface and upper rounded edge of the operating head 14, untilsubstantially the position shown in full lines in Fig. 5 is reached. Atthis point the returning pull of the springs 13, acting through saidrounded edges of the operating head 1 1 and trip lever 45, which serveas cams of gradually increasing effect and produce a graduallyincreasing downward component of pressure on the operating head as,causes such cam action to throw the trip lever downward from thefull'line position to the dotted line position in Fig. 5, and as thetrip lever thus swings downward the cross head 16 with its associatedparts swings in a counterclockwise direction from the full line positionto the dotted line position shown in Fig. 5. This movement of the crosshead. 16 and of the movable member of the magneto with it is produced bythe action of the springs 13; but the momentum of the moving partscarries them past their normal or central positions, at which point thespeed is the highest, so thatthe finger 17 strikes the finger 18 andsnaps the movable electrode 19 away from the fixed electrode 20, asindicated in dotted lines in Fig. 5. This produces the desired ignitionspark between the electrodes 19 and 20. The returning springs 13 returnthe cross head 16 and the movable electrode to normal position after oneor two oscillations, leaving the parts as shown in Fig. i. As the triplever 36 is snapped down out of the way of the trip finger 45 at thebeginning of the counterclockwise movement, no drag on such movementoccurs, and an unretarded snap producing a high voltage and an effectivespark is obtained. The point at which the tripping'occurs may be variedby adjusting the screw 42; and though this point is at a slightlydifferent time in the cycle under starting and running conditions, withthe eccentric bushing 31 in its two positions, by reason of thearrangement of parts the height of the operating head 4A is the sameunder both conditions, and therefore the amount by which the movableparts of the magneto are turned from normal is likewise the same underboth conditions. The change of the position of the eccentric bushingfrom starting to running merely moves the trip lever bodily'to the leftrelatively to the reciprocating member 27, so as to cause the trippingto occur at a slightly earlier point in the cyclethat is, so that thespark is advanced. Because the movement of the rounded edge of the triplinger 15 on the operating head 16 is in the main a rolling movement,with very little sliding, and becausethese parts do not engage with ahammer blow, very little wear occurs, and one adjustment of the screw 12lasts for a great while, even though the engine is kept in continuousoperation.

I claim as my invention:

1. A magneto having an oscillating movable member which is biased to oneposition, said movable member being provided with a trip finger; incombination with a reciprocable member, and a pusher movably mounted onsaid reciprocable member and co-operating with said trip finger, saidpusher having a rounded operating side through which it engages saidtrip finger at a varying angle as it moves it, whereby the reactionofthe bias of the magneto produces between the trip finger and thepusher an increasing cam action which at a predetermined point pushesthe pusher out of the path of the trip finger and permits said bias tomove the movable member of the magneto to normal position.

2. A magneto having an oscillating movable member which is biased to oneposition, said movable member being provided with a trip finger; incombination with a reciprocable member, and a pusher movably mounted onsaid reciprocable member and co-operating with said trip finger, saidtrip finger having a rounded operating edge through which it is engagedby an edge of said. pusher at a varying angle as it is moved thereby,whereby the reaction of the bias of the magneto produces between thetrip finger and the pusher an increasing cam action which at apredetermined point pushes the pusher out of thepath of the trip fingerand permits said bias to move the movable member of the magneto tonormal position.

A magneto having an oscillating movable member which is biased. to oneposition, said movable member being provided with a tripfinger; incombination with a reciprocablc member, and a pusher movably mounted onsaid reciprocable member and co-operating with said trip finger, saidtrip finger and said pusher having an inter-engagement the line ofpressure transmission through which makes to the line of movement of thepusher relative to the reciprocable member an angle which decreases inthe movement of the movable member of the magneto from its normalposition by said pusher, whereby the reaction of the bias of the magnetoproduces between the trip finger and the pusher an increasing cam actionwhich at a predetermined point pushes the pusher out of the path of thetrip linger and permits said bias to move the movable member oi? themagneto to normal position.

4;. A magneto having an oscillating menu her biased to one position, atrip linger on said. oscillating member, a reeiprocable operatingmember, a trip lever pivoted on said reci n'ooable member and actinglongitudinally oil itsell? on said trip linger to move said oscillatingmember from. normal position, said trip linger and trip lever beingarranged so that as the trip lever pushes the trip linger the point ofengagement travels to produce an increasing component of pressure on thetrip lever at right angles to its length, whereby when a predeterminedposition is reached the trip lever is snapped out of the way by the biasoi said oscillating member to permit the trip finger and oscillatingmember to snap back.

5. A magneto having an oscillating member biased to one position, a triplinger on said oscillating member, a reeiprocable operating member, atrip lever pivoted on said reciynrocable member and actinglongitudinally o'l? itself on said. trip linger to move said oscillatingmember from normal position, said trip linger and. trip lever beingarranged so that as the trip lever pushes the trip linger the point ofenga 'einent passes over an edge to produce a component of pressureperpendicular tothe length of the trip lever, whereby at a predeterminedpoint the trip lever is snapped out oi. the way by the bias of saidoscillating member to permit the trip-linger and oscillating member tosnap back.

(3. A. magneto having an oscillating member biased to one position, atrip linger on said oscillating member, a reciprocable operatin member,a trip lever pivoted on said reciprocible member and actinglongitudinally oil. itself on said. trip linger to move said oscillatingmember from normal position, said trip linger and trip lever being inanged so that as the trip lever pushes the trip finger the point ol.engagement passes over an edge to produce a component oil. pressureperpendicular to the length ol. the trip lever, wherein; at apredetermined point the trip lever is snapped out of the way by the biasof said. oscillating member to permit the trip-linger and oscillating nember to snap back, and a spring acting on said trip lever in oppositionto such perpendicular component of pressure.

7. magneto having an. oscillating member biased to one position, a tripfinger on said oscillating member, a reciprocable opcrating member, a.trip lever pivoted on said reciprocable member and acting longitudinally of itself on said trip linger to move said oscillating memberfrom normal position, said trip linger and trip lever being arranged sothat as the trip lever pushes the trig linger the point ol? engagementpasses over an edge to produce a componcnt oil. pressure pcrpeinlicularto the length oi the trip lever, \vlmrcby at a predetermined point thetrip lever is snapped out o'l the wa to permit the trip-linger andoscillating member to snap back, and means for adjusting normal positiono'li said trip lever about its pivot to adjust the point at which suchperpelnlicular component of pressure ell'ccts such snapping,

S. A magneto having an oscillating member biased to one position, a triplinger on said oscillatiiig member, a reciprocable open ating member, atrip lever lillYOli'etl on said reci n'ocable member and actinglougitudinally oil itself on said trip linger to move said oscillatingmember 'lrom llOYil'lill position, said trip linger and trip lever beingarranged so that as the tr p le pushes the trip linger the point oi overa i edge to produce a compoiunt o'l pressure perpeiulicular to thelength ol the trip lever, whereby at a predetermined point the triplever is snap 'ied out of the way to permit the trip-lingmf andoscillating member to snap baclr, and means for ad justin said. triplever longitudinally with respect to said reciprocable nan-libel to varythe point in. the movement (it the reciprocable member at which such snaiping of the trip lever occurs.

9. A. magneto having an oscillating momi. biased to one position, a triplinger on said oscillating member, a reciprocable operating member, atrip lever pivoted on. said rcciprocable member and zit-linglongitudinallv oi? itsell on said trip linger to move said oscillatingmember from normal position, said trip ling arran ed. so that as thetrip lever pus] %s the Ll'll) linger the point of engagement passes overan edge to produce a component of pres ure pcrpcndifcular to the ion thoi the trip lever, wherein at a predetermined point the trip lever issnapped out of the way to permit; the trip-linger and. oscillatingmember to sa i, back, the pivotal inountingot said trip lever on saidreciprocable member including a pivot pin on one ol' said parts and aneccentric bushing surrounding said pivot pin and. fitting within theother of said parts, and means for posiengagement pa: 3

tioning said bushing in either o'l? two positions in both o't which itsthickest and thinnest portions are substantially in the line oi? thelength of said. trip lever.

10. A magneto having an oscillating member biased to one pos :ion, atrip linger on said oscillating nwmber, a reciprocable operating member,a trip lever pivoted on said recimoeable member and actinglongitudinally of itself on said trip linger to move said oscillatingmember from normal position, said trip linger and trip er and trip leverbeing j S ll lever being arranged so that as'the trip lever pushes thetrip finger the point of engagement passes over an edge to produce acomponent of pressure perpendicular to the length of ti e trip lever,whereby at a predetermined point the trip lever is snapped out of theway to permit the tripfinger and oscillating member to snap back, thepivotal mounting of said trip lever on said reciprocable memberincluding a pivot pin on one of said parts and an eccentric bushingsurrounding said pivot pin and fitting within the other of said parts,and means for limiting the movement of said bushing to an angle of whichthe center produces in the direction of such component of pressure themaximum movement of said trip lever of which said eccentric is capable.

11. A magneto having an oscillating member biased to one position, atrip finger on said oscillating member, a reciprocable 0pcrating member,a trip lever pivoted on said reciprocable member and actinglongitudinally of itself on said trip finger to move said oscillatingmember from normal position, said trip finger and trip lever beingarranged so that as the trip lever pushes the trip finger the point ofengagement passes over an edge to produce a component of pressureperpendicular to the length of the trip lever, whereby at apredetermined point the trip lever is snapped out of the way to permitthe trip-finger and oscillating member to snap back, the pivotalmounting of said trip lever on said reciprocable member including apivot pin on one of said parts and an eccentric bushing surrounding saidpivot pin and fitting within the other of said parts, and means forpositioning said bushing in either of two positions in both of which theposition of the free end of said lever in the direction of saidcomponent of pressure is substantially the same.

12. A magneto having an oscillating member whichis biased to oneposition, and a trip linger on said oscillating member; in combinationwith an operating member having a pivot pin, an eccentric bushingmounting on said pivot pin, a trip lever mounted on said eccentricbushing and co-operating with said trip finger, and an abutment carriedby said operating member and limiting the movement oi? said trip lever.

13. A magneto having an oscillating member which is biased to oneposition, and a trip finger 011 said oscillating member; in combinationwith an operating member having a. pivot pin, an eccentric bushing mounted on said pivot pin, a trip lever mounted on said eccentric bushing andco-operating with said trip finger, said trip lever being reversible inposition on said eccentric bushing. p

14. A magneto having an oscillating member which is biased to oneposltion, and

a trip finger on said oscillating member; in combination with anoperating member having a pivot pin, an eccentric bushing mount ed onsaidpivot pin, a trip lever mounted on said eccentric bushing andco-operating with said trip finger, said trip lever being substantiallysymmetrical about its longitudinal axis with respect to its pivotalmounting and also with respect to its operating end so that it may beplaced on said bushing in either position without varying the operation.

15. A magneto having an oscillating member which is biased to oneposition, and a trip finger on said oscillating member; in combinationwith an operating member having a pivot pin, an eccentric bushingmounted on said pivot pin, a trip lever mounted on said eccentricbushing and cooperating with said trip finger, said trip lever beingsubstantially symmetrical about its longitudinal axis with respect toits pivotal mounting and also with respect to its operating end so thatit may be used without change for either right or left hand mountingsand may be placed in either position on the eccentric.

16. A. magneto having an oscillating member biased to one position, atrip finger on said oscillating member, a reciprocable operating member,a trip lever pivoted on said reciprocable member and actinglongitudinally of itself on said trip finger to move said oscillatingmember from normal position, said trip lever and said trip finger havingan inter-engagement the line of pressure transmission through whichvaries in direction in the movement of the movable mem bers by said triplever, and the bias of said oscillating member being sufiiciently strongso that it swings the trip lever on its pivot out of engagement withsaid trip finger when the angle between said line of pressuretransmission and the trip lever becomes sufficiently great.

17 A magneto having an oscillating movable member which is biased to oneposition, said movable member being provided with a trip finger incombination with a reciprocal member, and a pusher movably mounted onsaid reciprocable member and co-operating with said trip finger to movesaid movable member as said reciprocable member moves and by thereaction from the bias of the movable member to push the pusher out ofthe path of the trip finger to permit said movable member to return whenit has reached a predetermined point.

1.8. A magneto having an oscillating movable member which is biased toone position, said movable member being provided with a trip finger; incombination with a reciprocable member, and a pusher movably mounted onsaid reciprocable-member and co-operating with said trip finger, saidtrip line of pressure transinisson and said pusher becomes sufficientlygreat.

In witness whereof I have hereunto set my hand at Indianapolis Indiana,this 18th day of July, A. D. one thousand nine hundred and eighteen.

ARTHUR R. BAKER.

